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Research of Water Absorption and Release Mechanism of Superabsorbent Polymer in Cement Paste

The water absorption and release properties of superabsorbent polymers’ (SAP) internal curing agent are affected by many factors, such as solution properties, the ambient temperature and humidity and the particle size of SAP, which determine the curing effect and the durability of cement concrete st...

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Autores principales: Qin, Xiao, Lin, Yongkang, Mao, Jie, Sun, Xiaolong, Xie, Zhengzhuan, Huang, Qingjian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10384043/
https://www.ncbi.nlm.nih.gov/pubmed/37514451
http://dx.doi.org/10.3390/polym15143062
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author Qin, Xiao
Lin, Yongkang
Mao, Jie
Sun, Xiaolong
Xie, Zhengzhuan
Huang, Qingjian
author_facet Qin, Xiao
Lin, Yongkang
Mao, Jie
Sun, Xiaolong
Xie, Zhengzhuan
Huang, Qingjian
author_sort Qin, Xiao
collection PubMed
description The water absorption and release properties of superabsorbent polymers’ (SAP) internal curing agent are affected by many factors, such as solution properties, the ambient temperature and humidity and the particle size of SAP, which determine the curing effect and the durability of cement concrete structures directly. In this paper, the variation rule of the water absorbing capacity of SAP in simulated cement paste under different solutions and environmental conditions was studied. Based on microscopic image technology, the dynamic swelling behavior of the SAP particles was explored. The water release performance of SAP in cement paste was analyzed by both the tracer method and the negative pressure method. The results show that the water absorption of SAP in cement paste varied from 27 to 33 times. The ionic valence had a significant effect on the water absorption capacity of SAP, which suggests that the larger the ionic radius, the lower the absorption of SAP. The higher the temperature of the solution, the greater the water absorption rate of SAP. While the SAP particle size was less than 40–80 mesh, a slight ‘agglomeration effect’ was prone to occur, but the absorption state of SAP was more stable. Based on the swelling kinetic equation of SAP and the time-dependent swelling morphology of SAP in cement paste, a swelling kinetic model was established. The water release performance of SAP was less affected by the capillary negative pressures, and it would not release the water prematurely during the plastic stage, which was conducive to the continuous internal curing process of hardened paste in the later stage.
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spelling pubmed-103840432023-07-30 Research of Water Absorption and Release Mechanism of Superabsorbent Polymer in Cement Paste Qin, Xiao Lin, Yongkang Mao, Jie Sun, Xiaolong Xie, Zhengzhuan Huang, Qingjian Polymers (Basel) Article The water absorption and release properties of superabsorbent polymers’ (SAP) internal curing agent are affected by many factors, such as solution properties, the ambient temperature and humidity and the particle size of SAP, which determine the curing effect and the durability of cement concrete structures directly. In this paper, the variation rule of the water absorbing capacity of SAP in simulated cement paste under different solutions and environmental conditions was studied. Based on microscopic image technology, the dynamic swelling behavior of the SAP particles was explored. The water release performance of SAP in cement paste was analyzed by both the tracer method and the negative pressure method. The results show that the water absorption of SAP in cement paste varied from 27 to 33 times. The ionic valence had a significant effect on the water absorption capacity of SAP, which suggests that the larger the ionic radius, the lower the absorption of SAP. The higher the temperature of the solution, the greater the water absorption rate of SAP. While the SAP particle size was less than 40–80 mesh, a slight ‘agglomeration effect’ was prone to occur, but the absorption state of SAP was more stable. Based on the swelling kinetic equation of SAP and the time-dependent swelling morphology of SAP in cement paste, a swelling kinetic model was established. The water release performance of SAP was less affected by the capillary negative pressures, and it would not release the water prematurely during the plastic stage, which was conducive to the continuous internal curing process of hardened paste in the later stage. MDPI 2023-07-16 /pmc/articles/PMC10384043/ /pubmed/37514451 http://dx.doi.org/10.3390/polym15143062 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Qin, Xiao
Lin, Yongkang
Mao, Jie
Sun, Xiaolong
Xie, Zhengzhuan
Huang, Qingjian
Research of Water Absorption and Release Mechanism of Superabsorbent Polymer in Cement Paste
title Research of Water Absorption and Release Mechanism of Superabsorbent Polymer in Cement Paste
title_full Research of Water Absorption and Release Mechanism of Superabsorbent Polymer in Cement Paste
title_fullStr Research of Water Absorption and Release Mechanism of Superabsorbent Polymer in Cement Paste
title_full_unstemmed Research of Water Absorption and Release Mechanism of Superabsorbent Polymer in Cement Paste
title_short Research of Water Absorption and Release Mechanism of Superabsorbent Polymer in Cement Paste
title_sort research of water absorption and release mechanism of superabsorbent polymer in cement paste
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10384043/
https://www.ncbi.nlm.nih.gov/pubmed/37514451
http://dx.doi.org/10.3390/polym15143062
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